ALEXANDER VON HUMBOLDT. 137 internal connexion of apparently foreign phenomena., is clearly xinderstood, and how Humboldt has gradu- ally introduced us to those great natural laws wMclh rule in the apparently anomalous whole, and which had :been hitherto concealed from the eye of the student/' Hxunboldt's travels are not written for the great public, and therefore they have all been modi- fied by other writers for the popular taste ; but these modifications even are only intelligible to the more intellectual reader, and can only be appreciated by him. Every man, even the illiterate follower of material interests, knows the name of Humboldt,, but liis works are only read by the thinkers, for it is not Humboldt's manner to describe his personal adven- tures on his travels, and afford that amusement, which the travels and voyages of many others are intended to awaken. His descriptions are all distinguished for their real scientific character, which requires intelli- gence, education, and serious reflection in the reader. The results of the Asiatic journey, which Humboldt has given in his work on Central Asia, are very various, and cannot yet be combined under one common head. The most important new investigations which have liere led to further inquiries, are the treatise on the mean altitude of the great continent of the earth, on the table-lands of the interior of Asia, on the mountain system of Knesslun, on the depression of the Caspian Sea, and its environs, below the level of the ocean; also historic-geographical investigations into the for- mer course of the River Oxus^ and communications on the boundary of perpetual snow. Besides this, the work contains plates, which give the mean tempera- ture of more than three hundred places, and besides the voluminous geognostic revelations of the Ural, the volcanos, the beds of gold, and on the produce of the gold washings in the Ural districts, and in Siberia, on the diamonds in the mountains, there are explanatory essays by Stanislaus Julien, on Chinese historical sources, additions by Klaproth, on volcanos, notes by "Valenciennes., on the sea-dogs of the Caspian Sea, &c.